python - string.split(text) 或 text.split() : what's the difference?

Question

有一件事我不明白......

假设您有一个 text = "hello world"并且您想要拆分它。

在某些地方，我看到人们想要拆分文本:

string.split(text)

在其他地方，我看到人们只是在做:

text.split()

有什么区别？为什么你以一种方式或另一种方式做？你能给我一个理论解释吗？

Answer 1

有趣的是，两者的文档字符串在 Python 2.5.1 中并不完全相同:

>>> import string
>>> help(string.split)
Help on function split in module string:

split(s, sep=None, maxsplit=-1)
    split(s [,sep [,maxsplit]]) -> list of strings

    Return a list of the words in the string s, using sep as the
    delimiter string.  If maxsplit is given, splits at no more than
    maxsplit places (resulting in at most maxsplit+1 words).  If sep
    is not specified or is None, any whitespace string is a separator.

    (split and splitfields are synonymous)

>>> help("".split)
Help on built-in function split:

split(...)
    S.split([sep [,maxsplit]]) -> list of strings

    Return a list of the words in the string S, using sep as the
    delimiter string.  If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified or is None, any
    whitespace string is a separator.

深入挖掘，您会发现这两种形式是完全等价的，如string.split(s)实际上调用s.split() (搜索 split 函数)。